Marine propeller with reverse thrust cup

Abstract

A marine propeller with reverse thrust cup includes a propeller hub, propeller blades each having a leading blade face and a trailing blade face provided on the propeller hub and a reverse thrust cup provided in the trailing blade face of each of the propeller blades.

What is claimed is: 
     
       1. A marine propeller, comprising:
 a propeller hub; 
 a plurality of propeller blades each having a leading blade face, a trailing blade face and a leading blade edge, an outer blade edge and a trailing blade edge carried by said propeller hub; 
 a reverse thrust cup provided in said trailing blade face of each of said plurality of propeller blades, the reverse thrust cup having a cup lip provided in said trailing blade face and said cup lip including:
 a radial lip portion extending generally radially with respect to said propeller hub; and 
 an outer lip portion extending from said radial lip portion and along said outer blade edge to said trailing blade edge of each of said plurality of propeller blades. 
 
 
     
     
       2. The marine propeller of  claim 1  further comprising a generally convex cup surface extending from said cup lip. 
     
     
       3. The marine propeller of  claim 1  further comprising a trailing cup edge extending from said outer lip portion. 
     
     
       4. The marine propeller of  claim 1  further comprising a water flow path between said radial lip portion of said cup lip and said propeller hub. 
     
     
       5. The marine propeller of  claim 4  wherein said radial lip portion comprises a tapered radial lip portion. 
     
     
       6. The marine propeller of  claim 4  wherein said radial lip portion comprises a truncated radial lip portion. 
     
     
       7. A marine propeller, comprising:
 a propeller hub; 
 a plurality of propeller blades each having a leading blade face, a trailing blade face, a leading blade edge, an outer blade edge and a trailing blade edge carried by said propeller hub; and 
 a reverse thrust cup provided in said trailing blade face of each of said plurality of propeller blades and bounded by said outer blade edge and said trailing blade edge, the reverse thrust cup having a cup lip provided in said trailing blade face and said cup lip including:
 a radial lip portion extending generally radially with respect to said propeller hub; and 
 an outer lip portion extending from said radial lip portion and along said outer blade edge to said trailing blade edge of each of said plurality of propeller blades. 
 
 
     
     
       8. The marine propeller of  claim 7  further comprising a generally convex cup surface extending from said cup lip. 
     
     
       9. The marine propeller of  claim 7 , further comprising a trailing cup edge extending from said outer lip portion. 
     
     
       10. The marine propeller of  claim 7  further comprising a water flow path between said radial lip portion of said cup lip and said propeller hub. 
     
     
       11. The marine propeller of  claim 10  wherein said radial lip portion comprises a tapered radial lip portion. 
     
     
       12. The marine propeller of  claim 10  wherein said radial lip portion comprises a truncated radial lip portion. 
     
     
       13. A marine propeller, comprising:
 a propeller hub; 
 a plurality of propeller blades each having a leading blade face, a trailing blade face, a leading blade edge, an outer blade edge and a trailing blade edge carried by said propeller hub; and 
 a reverse thrust cup provided in said trailing blade face of each of said plurality of propeller blades; and 
 wherein said reverse thrust cup includes a cup lip having a radial lip portion generally parallel and spaced-apart with respect to said leading blade edge and an outer lip portion generally spaced-apart with respect to the outer blade edge, and said reverse thrust cup is bounded by said cup lip, said outer blade edge and said trailing blade edge. 
 
     
     
       14. The marine propeller of  claim 13  further comprising a water flow path between said radial lip portion of said cup lip and said propeller hub. 
     
     
       15. The marine propeller of  claim 14  wherein said radial lip portion comprises a tapered radial lip portion. 
     
     
       16. The marine propeller of  claim 14  wherein said radial lip portion comprises a truncated radial lip portion.